- #1
mst3kjunkie
- 16
- 0
the first
and the second:Homework Statement
Calculate the moment of inertia about a center axis of a long rod with an LxL square cross section
Homework Equations
moment of inertia (I) = the integral of the radius^2 dm
The Attempt at a Solution
I'm not really sure where to start with this one, but the I of a thin rod about its center is equal to 1/12 ML^2. This however, has a cross-section. How do I take this into account and solve the problem?
Homework Statement
A Hollow sphere is rolling along a horizontal floor at 5.0 m/s when it comes to a 30 degree incline. How far up the incline does it roll before coming back down?
omega (angular velocity) before incline=5.0 m/s
omega at top point on incline before rolling back=0m/s
Homework Equations
Moment of Inertia of a hollow sphere= 2/3MR^2
The Attempt at a Solution
once again, I'm not sure where to begin or how to set this one up, but I think if I could figure this out I could solve the problem.